Search for top-squark pairs decaying into Higgs or Z bosons in pp collisions at sqrt(s) = 8 TeV
V. Khachatryan
,
S. Baffioni
(1)
,
F. Beaudette
(1)
,
P. Busson
(1)
,
C. Charlot
(1)
,
T. Dahms
(1)
,
M. Dalchenko
(1)
,
L. Dobrzynski
(1)
,
N. Filipovic
(1)
,
A. Florent
(1)
,
R. Granier de Cassagnac
(1)
,
L. Mastrolorenzo
(1)
,
P. Mine
(1)
,
C. Mironov
(1)
,
I.N. Naranjo
(1)
,
M. Nguyen
(1)
,
C. Ochando
(1)
,
P. Paganini
(1)
,
R. Salerno
(1)
,
J.B. Sauvan
(1)
,
Y. Sirois
(1)
,
C. Veelken
(1)
,
Y. Yilmaz
(1)
,
A. Zabi
(1)
,
J.-L. Agram
(2)
,
J. Andrea
(2)
,
A. Aubin
(2)
,
D. Bloch
(2)
,
J.-M. Brom
(2)
,
E.C. Chabert
(2)
,
C. Collard
(2)
,
E. Conte
(2)
,
J.-C. Fontaine
(2)
,
D. Gele
(2)
,
U. Goerlach
(2)
,
C. Goetzmann
(2)
,
A.-C. Le Bihan
(2)
,
P. van Hove
(2)
,
S. Gadrat
(3)
,
S. Beauceron
(4)
,
N. Beaupere
(4)
,
G. Boudoul
(4)
,
S. Brochet
(4)
,
C.A. Carrillo Montoya
(4)
,
J. Chasserat
(4)
,
R. Chierici
(4)
,
D. Contardo
(4)
,
P. Depasse
(4)
,
H. El Mamouni
(4)
,
J. Fan
(4)
,
J. Fay
(4)
,
S. Gascon
(4)
,
M. Gouzevitch
(4)
,
B. Ille
(4)
,
T. Kurca
(4)
,
M. Lethuillier
(4)
,
L. Mirabito
(4)
,
S. Perries
(4)
,
J.D. Ruiz Alvarez
(4)
,
D. Sabes
(4)
,
L. Sgandurra
(4)
,
V. Sordini
(4)
,
M. Vander Donckt
(4)
,
P. Verdier
(4)
,
S. Viret
(4)
,
H. Xiao
(4)
V. Khachatryan
- Function : Author
S. Baffioni
- Function : Author
- PersonId : 20331
- IdHAL : stephanie-barrillon
- ORCID : 0000-0002-7075-1673
P. Busson
- Function : Author
- PersonId : 741166
- IdHAL : phbusson
- ORCID : 0000-0001-6027-4511
- IdRef : 033562466
R. Granier de Cassagnac
- Function : Author
- PersonId : 739189
- IdHAL : raphgrandecass
- ORCID : 0000-0002-1275-7292
- IdRef : 132136651
C. Mironov
- Function : Author
- PersonId : 1196248
- IdHAL : camelia-mironov
P. Paganini
- Function : Author
- PersonId : 739173
- IdHAL : pascal-paganini
- ORCID : 0000-0001-9580-683X
- IdRef : 183219406
J.-L. Agram
- Function : Author
- PersonId : 1147753
- IdHAL : j-l-agram
- ORCID : 0000-0001-7476-0158
- IdRef : 090333748
C. Collard
- Function : Author
- PersonId : 753602
- IdHAL : caroline-collard
- ORCID : 0000-0002-5230-8387
- IdRef : 223465992
E. Conte
- Function : Author
- PersonId : 755000
- IdHAL : eric-conte
- ORCID : 0000-0003-3154-3123
- IdRef : 122530209
P. van Hove
- Function : Author
- PersonId : 742701
- IdHAL : pierre-van-hove
- ORCID : 0000-0002-2431-3381
- IdRef : 264250834
M. Gouzevitch
- Function : Author
- PersonId : 741096
- IdHAL : maxime-gouzevitch
- ORCID : 0000-0002-5524-880X
- IdRef : 13627160X
M. Lethuillier
- Function : Author
- PersonId : 740178
- IdHAL : morgan-lethuillier
- ORCID : 0000-0001-6185-2045
- IdRef : 090177835
V. Sordini
- Function : Author
- PersonId : 739810
- IdHAL : viola-sordini
- ORCID : 0000-0003-0885-824X
- IdRef : 128184035
Abstract
A search for supersymmetry through the direct pair production of top squarks, with Higgs (H) or Z bosons in the decay chain, is performed using a data sample of proton-proton collisions at sqrt(s) = 8 TeV collected in 2012 with the CMS detector at the LHC. The sample corresponds to an integrated luminosity of 19.5 inverse femtobarns. The search is performed using a selection of events containing leptons and bottom-quark jets. No evidence for a significant excess of events over the standard model background prediction is observed. The results are interpreted in the context of simplified supersymmetric models with pair production of a heavier top-squark mass eigenstate stop[2] decaying to a lighter top-squark mass eigenstate stop[1] via either stop[2] to H stop[1] or stop[2] to Z stop[1], followed in both cases by stop[1] to t neutralino, where neutralino is an undetected, stable, lightest supersymmetric particle. The interpretation is performed in the region where the mass difference between the stop[1] and neutralino states is approximately equal to the top-quark mass (m[stop[1]] - m[neutralino] ~= m[t]), which is not probed by searches for direct stop[1] squark pair production. The analysis excludes top squarks with masses m[stop[2]]<575 GeV and m[stop[1]]<400 GeV at a 95% confidence level.